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US 6,617,048 B1Granted
Prepainted steel sheet and method for producing the same
AssigneesNKK Corporation, Dai Nippon Toryo Co., Ltd.
InventorsKeiji Yoshida, Kazumi Ito, Masaaki Yamashita, Hiroyuki Kato, Yasuhiro Toyoda, Yasuyuki Kajita, Susumu Ogawa, Nobuyoshi Kato
Life of this patent
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Abstract
A prepainted steel sheet has a chemically conversion-treated zinc-plated steel sheet and a coating formed on the surface of said zinc-plated steel sheet. The coating is formed by painting and baking of a solvent-type-paint composition. The paint composition contains a polyester resin.
Claims20
A one-coat-prepainted steel sheet comprising:
- a chemically conversion-treated zinc-plated steel sheet;
- a one-coat coating having a dried film thickness of not more than 10 μm, the one-coat coating being formed on a surface of said zinc-plated steel sheet;
- said one-coat coating being formed by one-coat-painting and baking of an organic solvent paint composition, the an organic solvent paint composition containing a polyester resin (A) and a melamine resin (D) as main components, the melamine resin (D) being in an amount of 5 to 30 parts by weight relative to 100 parts by weight of the polyester resin (A);
- said polyester resin (A) having a number-average molecular weight of 5000-25000, a glass transition temperature of 20-80° C., a hydroxyl value of 3-30 KOH mg/g and an acid value of 0-10 KOH mg/g;
- and
- said polyester resin (A) having polyalcohol components, 20-70 mol % of the polyalcohol components being cyclohexanedimethanol.
3 more elements
A one-coat-prepainted steel sheet comprising:
- a chemically conversion-treated zinc-plated steel sheet;
- a one-coat coating having a dried film thickness of not more than 10 μm, the one-coat coating being formed on a surface of said zinc-plated steel sheet;
- said one-coat coating being formed by one-coat-painting and baking of an organic solvent paint composition, the an organic solvent paint composition containing a polyester resin (A), an epoxy resin (B) having 180-1000 epoxy equivalents, and a melamine resin (D) as main components, the epoxy resin (B) being in an amount of 5-25 parts by weight, the melamine resin (D) being in an amount of 5-30 parts by weight, relative to 100 parts by weight of the polyester resin (A);
- said polyester resin (A) having a number-average molecular weight of 5000-25000, a glass transition temperature of 20-80° C., a hydroxyl value of 3-30 KOH mg/g and an acid value of 0-10 KOH mg/g;
- and
- said polyester resin (A) having polyalcohol components, 20-70 mol % of the polyalcohol components being cyclohexanedimethanol.
3 more elements
A one-coat-prepainted steel sheet comprising:
- a chemically conversion-treated zinc-plated steel sheet;
- a one-coat coating having a dried film thickness of not more than 10 μm, the one-coat coating being formed on a surface of said zinc-plated steel sheet;
- said one-coat coating being formed by one-coat-painting and baking of an organic solvent paint composition, the an organic solvent paint composition containing a polyester resin (A) and a curing agent as main components, the curing agent being in an amount of 3-20 parts by weight relative to 100 parts by weight of the polyester resin (A);
- said curing agent comprising a blocked polyisocyanate compound (C) and a melamine resin (D), wherein a solids content mixing weight ratio (C)/(D) is 100/0-15/85;
- said polyester resin (A) having a number-average molecular weight of 5000-25000, a glass transition temperature of 20-80° C., a hydroxyl value of 3-30 KOH mg/g and an acid value of 0-10 KOH mg/g;
- and
- said polyester resin (A) having polyalcohol components, 20-70 mol % of the polyalcohol components being cyclohexanedimethanol.
4 more elements
A one-coat-prepainted steel sheet comprising:
- a chemically conversion-treated zinc-plated steel sheet;
- a one-coat coating having a dried film thickness of not more than 10 μm, the one-coat coating being formed on a surface of said zinc-plated steel sheet;
- said one-coat coating formed by one-coat-painting and baking of a solvent-type-paint composition, the solvent-type-paint composition containing polyester resin (A), an epoxy resin (B) having 180-1000 epoxy equivalents, and a curing agent as main components, the epoxy resin being in an amount of 5-25 by weight, the curing agent being in an amount of 3-20 parts by weight, relative to 100 parts by weight of the polyester resin (A);
- said curing agent containing a blocked polyisocyanate compound (C) and a melamine resin (D), wherein a solids content mixing weight ratio (C)/(D) is 100/0-15/85;
- said polyester resin (A) having a number-average molecular weight of 5000-25000, a glass transition temperature of 20-80° C., a hydroxyl value of 3-30 KOH mg/g and an acid value of 0-10 KOH mg/g;
- and
- said polyester resin (A) having polyalcohol components, 20-70 mol % of the polyalcohol components being cyclohexanedimethanol.
4 more elements
Dependencies are inferred from the claim text.